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LOANS, Summary of Loans by Category (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Category
Nov. 12, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Summary of Loans by Category [Abstract]        
Loans, gross $ 2,143,623   $ 1,957,197  
Allowance for loan losses (24,197)   (23,126) $ (21,461)
Loans, net 2,119,426   1,934,071  
West Texas State Bank [Member]        
Summary of Loans by Category [Abstract]        
Loans acquired   $ 198,400    
Loans acquired, fair value   196,178    
Discount on acquired loans   $ 2,200    
Commercial Real Estate [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 658,195   538,037  
Allowance for loan losses $ (5,049)   (5,579) (3,769)
Commercial [Member]        
Summary of Loans by Category [Abstract]        
Number of sub-categories of loans | Category 2      
Commercial [Member] | Specialized [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross $ 309,505   305,022  
Allowance for loan losses (2,287)   (2,516) (2,367)
Commercial [Member] | General [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 441,398   427,728  
Allowance for loan losses (9,609)   (8,173) (10,151)
Consumer [Member] | 1-4 Family Residential [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 362,796   346,153  
Allowance for loan losses (2,093)   (2,249) (1,787)
Consumer [Member] | Auto Loans [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 215,209   191,647  
Allowance for loan losses (3,385)   (2,994) (2,068)
Consumer [Member] | Other Consumer [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 74,000   70,209  
Allowance for loan losses (1,341)   (1,192) (971)
Construction [Member]        
Summary of Loans by Category [Abstract]        
Loans, gross 82,520   78,401  
Allowance for loan losses $ (433)   $ (423) $ (348)